A car engine has a power of 20   kW . The car makes a roundtrip of 1 hour. If the thermal efficiency of…

A car engine has a power of 20 kW. The car makes a roundtrip of 1 hour. If the thermal efficiency of the engine is 40% and the ambient temperature is 300 K. The energy generated by fuel combustion is
  1. 180000 kJ
  2. 240000 kJ
  3. 360000 kJ
  4. 270000 kJ

Solution

Energy produced by car engine in 1 hour

 =20×1000×3600⇒7.2×107 J

Considering efficiency of 40%,

Q=Eη=7.2×1070.4=180000 kJ

Asked in: AP EAMCET 2022 (04 Jul Shift 1)

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